Linux下iptables防火牆放開相關連接埠拒絕相關連接埠及查看已放開連接埠

Linux下iptables防火牆放開相關連接埠拒絕相關連接埠及查看已放開連接埠

我用的是fedora 14

1. 查看iptables 防火牆已經開啟的連接埠:/etc/init.d/iptables status

[root@hzswtb2-mpc ~]#/etc/rc.d/init.d/iptables status 或者 service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306

Chain FORWARD (policy ACCEPT)
num target prot opt source destination

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

 

2. 開啟 tcp 8080連接埠

/sbin/iptables -I INPUT -p tcp --dport 8080 -j ACCEPT

/etc/rc.d/init.d/iptables save 或者 service iptables save #儲存配置 /etc/rc.d/init.d/iptables restart 或者 service iptables restart #重啟服務

[root@hzswtb2-mpc ~]# /sbin/iptables -I INPUT -p tcp --dport 8080 -j ACCEPT
[root@hzswtb2-mpc ~]# /etc/rc.d/init.d/iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
[root@hzswtb2-mpc ~]# /etc/rc.d/init.d/iptables restart
iptables: Flushing firewall rules: [ OK ]
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]

[root@hzswtb2-mpc ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8080
2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306

3. 刪除chain INPUT指定規則1；

[root@hzswtb2-mpc ~]# iptables -D INPUT 1
[root@hzswtb2-mpc ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306

Chain FORWARD (policy ACCEPT)
num target prot opt source destination

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

4.Reject 指定連接埠；

[root@hzswtb2-mpc ~]# /sbin/iptables -I INPUT -p tcp --dport 8080 -j REJECT
[root@hzswtb2-mpc ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 REJECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8080 reject-with icmp-port-unreachable
2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306

Chain FORWARD (policy ACCEPT)
num target prot opt source destination

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination